https://phys.org/news/2018-09-tesla-fall-criminal.html

The Justice Department's investigation of Musk and his statement on Twitter that he had "funding secured" for a take-private deal is running alongside a civil probe, Bloomberg reported, citing two people familiar with the matter.

Tesla has been under market regulators' scrutiny since Musk said on Twitter on August 7 that he was considering taking Tesla private, before reversing the plan two weeks later.